Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).
This explains exactly why vaccines are effective to extremely effective.
ATP is a molecule that stores <u>ENERGY</u> in its phosphorus bonds.
The answer to this question is 1.DNA because RNA is single stranded.
It refers to the idea the prehistoric oceans combined with lightning formed the building blocks of life.
Explanation:
The primordial soup refers to the idea that prehistoric oceans combined with lightning to form the building blocks of life.
The soup can be regarded as the soup of life through which the first nuclei acids were synthesized.
- It was a hypothesized set of conditions available when the earth was initially formed about 4.5 billion years ago.
- The miller-urey experiment was set up in 1930's to demonstrated this soup of life.
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Answer:
1st point describes both the sperm and ovum.